This is a large 24mm heart-shaped blue fire RESIN opal pendant. It has a 25-3/4" tarnish-free stainless-steel chain that has a very EZ On/Off magnetic clasp. The clasp is silver-plated; the pendant chain is 100% stainless-steel. (Do not wear magnetic jewelry if you have a pacemaker, insulin pump, defib implant or some other type of medical implant without consulting with your physician first!) If you do not want the magnetic clasp, message us (there is a place on the order form to do so), and we will un-clip the magnet and send it with a large lobster claw clasp instead. This is a sparkly blue-fire resin opal that has a lot of bling to it. And - YES, Virginia (AND Diana B. Sierra!) - a resin opal is considered a STONE and a gemstone! Just do a Google search and ask Google "Can resin be used to make opal stones?" Any person, including Diana B Sierra, who insists that a resin opal is NOT a stone has bats in their belfry.